Well the Taylor kit AND the brush both came in tonight, so I'm going to brush tomorrow(getting in the pool to do so) and attempt to run a test. I will admit, this kit is intimidating. ��

I added HALF a 121 oz jug of bleach last night since I skipped adding it for two nights, but was worried about adding too much till the kit got here. I'm going to check with the OTO tonight, but I think it will be fine to wait till tomorrow night after I've had a chance to brush before adding more bleach. Unless of course it's not dark yellow, then I'll add. Hopefully now that the kit is here along with the brush I can knock out everything that may be in there. It may just be dirt/pollen settling in the creases, it WAS pretty dry the first week or so after we opened the pool and there is a tree nearby...it also doesn't help that when my husband mows the yard it kicks up a dust storm that blows straight thru the backyard. It does sound like mustard algae though, especially the way it keeps showing up each morning after I vacuum.

Anyway, thanks for the help, I'll report my findings with the test tomorrow.